TOEFL Reading: ETS-TOEFL阅读机经 - C113_ROIGEYH7F53L$

According to paragraph 4, Wegener felt confident that his theory are correct in part because A. contemporary scientists were unable to successfully challenge his evidence B. many different types of evidence seemed to support his theory C. his theory accounted for phenomena that earlier theories could not explain D. he had used the most advanced techniques available to gather his evidence